Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1997-10-21
2000-10-31
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
367112, 367118, G11B 7095
Patent
active
06141302&
ABSTRACT:
An optical recording/reproducing apparatus includes an irradiation optical system for irradiating a light beam from a light source onto a predetermined track of an optical recording medium having a plurality of neighboring tracks as a fine light spot so as to perform recording/reproduction of information or reproduction of information, and a detection optical system for detecting a returned light beam from the optical recording medium. A mask is arranged in a far field region sufficiently separated from a focal plane of the detection optical system, for masking marginal rays, in a direction perpendicular to the track, of the returned light beam, so that information reproduced from a track adjacent to the predetermined track upon reproduction of information on the predetermined track is reduced.
REFERENCES:
patent: 4953124 (1990-08-01), Koyama
patent: 5029261 (1991-07-01), Koyama et al.
patent: 5072437 (1991-12-01), Chikuma
patent: 5172366 (1992-12-01), Chikuma
patent: 5206852 (1993-04-01), Kim et al.
Patent Abstracts of Japan, Kokai No. 2-208835, vol. 14, No. 504, (P-1127), Nov. 5, 1990.
Koyama Osamu
Yamawaki Takeshi
Canon Kabushiki Kaisha
Young W. R.
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